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C. A. SAWTELLL comsusnow ENGINE. APPLICATION FILED SEPT. 16, 19,12.

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INTERNAL comsusnom ENGINE.

APPLICATION FILED SEPT- 16, I912.

C. A. SAWTE'LLE.

INTERNAL CQMBUSTION ENGINE. APPLICATION HLED SEPT. 16. 19:2.

Patented Aug. 29, 1916.

4 SHEETSSHEET 3.

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C. A. SAWTELLE.

INTERNAL COMBUSTION ENGINE. APPLICATION FILED SEPT- 16. I912.

Patented Aug. 29, 1916.

4 SHEETS-SHEET 4.

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w vlmwoao E-JA'WTELLE, 0F DAYTON, 0HIQ AS$IGNOR ONE-THIRD W JAMES SAUNDERS AND 0NE-THIRTD T0 JAMES E. 'CRONAN.

TNTERNAL COMEUSTION ENGINE.

Specification of Letters llatent.

Patented Aug. 2%, rare.

To all whom it may concern:

Be it known that ll, CHAnLns A. Saw'rnnnn, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of @hio, have invented pertain new and useful Improvements in Internal-Combustion Engines of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to internal combustion engines.

The object of the invention is to provide a simple, positively actuated device to control the admission of explosive mixture to the engine cylinder and the exhaust of the. burnt gases therefrom.

To this end it is a further object of the invention to admit the mixture through a supplemental cylinder having positively actuated means to control the admission of the mixture, and also to exhaust the burnt gases through this supplemental cylinder, the controlling devices being so timed that the inlet and exhaust passages, respectively, will be connected with the engine'cylinder at the proper time.

Another object of the invention is to provide means whereby. the controlling devlces of the supplemental cylinder will cause the ignition circuit to be closed for a brief interval only at the time of the explosion and whereby a single circuit may be connected with all the spark plugs.

Another object of the invention is to pro vide a device for adequately lubricating the several parts of the engine.

Another object of the invention is to provide means to apply a portion of the heat from the enginecylind'er to the carburetor.

lln the accompanying drawings, Figure 1 is a vertical, sectional view, taken centrally through one cylinder and the crank case of an engine embodying my invention and showing the power piston at the beginning of its stroke; Figs. 2, 3, 4t, 5, 6 and '2' are similar views, partly broken away, showing the mechanism with the power piston in successive positions; Fig. 8 is a side elevation of the engine, partly broken away; Fig. 9' is an elevation of that side of the engine opposite that shown in Fig; 8; and Fig. 10 is a sectional .detail view of the oil distributor. n' in these drawings ll have illustrated one embodiment of my invention and have shown the same as applied to a four cycle, internal combustion engine, but it will be understood that the invention is not limited to engines of the type here shown. As here illustrated the engine comprises a cylinder l which is of the ordinary watr jacketed type, is mounted upon a base 2 and has extending downwardly therefrom a crank casing 3 within which is mounted a crank shaft 4. and which is provided with an, oil receptacle 5. The power piston 6 is an ordinary trunk piston and is connected by connecting rods 7 with-the crank shaft 4:.

The invention maybe applied to an engine comprising any number of cylinders. Tn

the present instance the engine comprises essential respects to the one cylinder illus- .ment withthe main cylinder and is in open communication therewith at its lower-end. Preferably, the supplemental cylinder is formed integral with the main cylinder and it'i's so shown in the present drawings. The supplemental cylinder may communicate with the source of supply for the explosive mixture or fluid in any manner that may seemdesirable but I have here shown the supplemental cylinder. as provided with an inlet port 9 which communicates with ,an annular passage 10 extending about the supplemental cylinder. and communicating with the intake manifold 11 which, in turn, is connected with the carbureter 12. Tu

' that form of the invention here illustrated pl. also find it desirable to exhaust the burnt gases through the supplemental cylinde 1. though this is not essential to the successful application of the broader features of the invention. ,As here illustrated the supplemental cylinder has an exhaust port 13 .which communicates-with an annular paslltl sage 14 which, in turn, is connected with the exhaust manifold 15. The intake and exhaust ports are preferably arranged one above-the other and there may be any suitable number of these ports, there being two of each as illustrated in the present drawm s.

lhe supplemental cylinder is provided with suitable devices which are positively actuated, preferably from the engine itself, to control the admission of the fluid to the engine cylinder and the exhaust of the burnt gases therefrom. While this mechanism may, within the scope of the invention, as-

sume various forms it is here illustrated as comprising two relatively movable cooperating members having ports adapted to be moved into and out of alinement with the inlet and exhaust ports. One of these members is shown as comprising a supplemental piston 16, the lower portion of which is hollow and is provided with ports 17 corresponding in number with the number of inlet and exhaust ports, two in the present instance, and so arranged in the supplemental pistoii that the reciprocation of said piston will move the said ports successively into and out of alinementwith the 'corresponding inlet and exhaust ports of the supplemental cylinder. The other controlling lever is shown as comprising a sleeve 18 mounted between the supplemental cylinder and the supplemental piston and provided with ports 19 corresponding in arrangement with the ports 17 .of the supplemental piston. While I have shown the second of the cooperating members and I shall refer to the same'as a sleeve it will be understood that an annular construction is not essential to the operation of the invention but that. the same functions may be accomplished by means of sliding members of various shapes.

The supplemental piston and the sleeve are capable of reciprocatory movement rel atively one to the other and to the supplemental cylinder and this movement may be impartedto the 'members in various man-. ners. It is desirable, however, that they should be driven from the engine shaft and they are here shown as connected with eccentric straps 20 and 21, respectively, which are mounted on eccentrics 22 and 23 carried by a shaft 24 journaled on the engine above the supplemental cylinders. It will be noted that each sleeve is shown as provided with two eccentrics 23, oneon each side of the supplemental piston, this being for the purpose of more efiectually preventing binding and causing a freer operation of the sleeve. This shaft is connected by suitable gearing with a shaft 25 which, in turn, is connected by a worm and worm'gear with the engine shaft 4. The gearing 1s of such ratio that the supplemental piston will make one complete reciprocation for every two complete reciprocations of the main piston, that is, one complete reciprocation for each explosion within the engine. The eccentrics are arranged to time the movements of the sleeve and the supplemental piston in such a manner that they will open the inlet and exhaust ports once for every complete reciprocation of the supplemental piston and will cause the opening of these ports to take place at the proper time.

In Fig. 1 the main piston and the several parts of the'mechanism are shown in the positions which they occupy at the beginning of the power stroke. It will be noted that the positions of-the supplemental piston and sleeve are such that both the inlet ports and the exhaust ports are closed. The downward movement of the power piston causes the supplemental piston to move downward and the sleeve to move upward a short distancebut the ports 17 and 19 of the piston and sleeve, respectively, are not brought into alinement until the power piston has practically completed its downward stroke. This will be seen from Fig. 2 in which the ports are still out of alinement one with the other and the main piston is near the lower limit of its movement. Consequently, the exhaust port does not open until the full power of the explosion has been utilized. As the connecting rod swings across 1ts center and the main piston begins its upward movement the supplemental piston is'moved downward a distance suflicient to bring its port 17 into alinement with the port 19 of the sleeve, which is already in alinement with the exhaust port 13 of the supplemental cylinder, thereby quickly opening the exhaust port and permitting the escape of the burnt gases upon the upward stroke of the power piston, as shown in 3. As the power piston continues its upward movement the supplemental piston continues to move downward and when the two pistons reach the respective limits of their movements they are quite close together and the burnt gases will have been very completely exhausted from the main cylinder. It will be noted in Fig. 4 that the supplemental piston has moved downward to such an extent that the upper edge of its port is almost even with the lower edge of the exhaust port but that the sleeve has also moved downward a distance sufiicient to cause its port to overlap both the port of the supplemental piston and the port of the supplemental cylinder, thus preventing the closing of the exhaust port. As

the connecting rod again swings across its center and the main piston begins its downward movement the sleeve is given a quick downward movement and its port moved out'of alinement with the exhaust port and into alinement with the intake port, thus closing the exhaust port and establishing communication between the intake port and the main cylinder. During the downward or suction movement of the power piston the sleeve moves downward until its port is in complete registration with the intake port and the supplemental piston moves upward, the relative movements not being sufficient, however, to close the inlet port. When the main piston reaches the lower limit of its suction stroke and begins its compression stroke the supplemental piston is moved upward a distance sufficient to carry its port out of alinement with the port in the sleeve, thus closing the intake passage and permitting the gas to be compressed within the main and supplemental cylinders upon the compression stroke of the main piston. During this stroke the supplemental piston and the sleeve both move upward into the position shown in Fig. 1, but their relative movements are such as to prevent the opening of either the intake or exhaust ports.

It is thought the operation of the controlling devices will be clear from the foregoing description and it will be noted that their movements relatively one to the other and to the supplemental cylinder are so timed that the ports will be maintained in their open or closed positions for relatively long periods and will be shifted quickly from one position to the other.

Any suitable system of ignition may be employed in connection with the mechanism for controlling the intake and exhaust for the main cylinder. I prefer, however, to mount the spark plug in the supplemental piston, as shown at 26, as this places the spark in the proper position and further enables the ignition circuit to be open at all times save only a brief interval at the time the explosion takes place and further enables me to employ a single circuit for all the cylinders of the engine and to eliminate the current distributing devices for the magneto. One side of this circuit is shown at 27 and extends from the magneto 28 along one side of the engine and is connected with binding posts 29 mounted in upwardly extending portions or side walls 30 projecting above the supplemental cylinder. Each of the binding posts 29 has an inwardly extending contact member 31, preferably of resilient metal and having its inner end arranged in the path of the spark plug 26 which is mounted in the supplemental piston 16. The contact member 31 is so positioned that it will be engaged by the spark plug and the circuit closed just prior to the completion of the upward stroke of the supplemental piston and the compression stroke of the main piston, thus closing the circuit through the plug and producing a spark to ignite the charge in the compression chamber. It will be understood, of course, that the plugs are grounded through the engine frame to complete the circuit.

The upwardly extending portions or side walls 30 extend to a point some distance above the eccentrics on the shaft 24 and are connected by a cap or closure 32, thus forming a housing for the upper parts of the mechanism. This housing being ad acent to the explosion chamber of the engine it is obvious that-the air within the same will become heated and I have here shown a conduit or pipe 33 communicating with the interior of the housing and connected at its lower end with the carbureter 12, thereby utilizing the heated air from the housing to warm the carbureter.

Mounted in the upper portion of the housing and arranged above the supplemental cylinders is a lubricating device comprising an outer casing 34: and an inner casing 37 rotatably mounted and having longitudinal movement within said outer casing. This lubricating device is connected by means of a tube 35 with an oil pump 36 located in the oil receptacle 5 of the crank case and operated in any suitable manner, preferably from the crank shaft 4. The outer casing of the lubricating device is provided with a series of ports 38 arranged one above the other and adapted to feed the oil onto the eccentrics. If desired each opening may be provided with a nipple 40 to cause the oil to drop accurately. The inner casing 37 is also provided with a series of openings 39, there being preferably one opening for each of the openings 38. These openings 39 are brought into partial or complete alinement with their corresponding openings 38 upon each rotation of the inner casing and the oil is fed through the opening 38. Preferably, the oil in the inner casing is normally under'pressure and to render this pressure uniform I provide the device at one end with a waste pipe 41 to return the oil to the oil receptacle in the crank case and interpose a spring-controlled check valve between the waste pipe and the lubricating device. The tension of this spring is such that a certain predetermined pressure is necessary to unseat the valve and permit the escape of the oil. Consequently, there is always an oil pressure within the inner casing and the amount of oil fed can be accurately regulated by adjusting the size of the opening formed when the corresponding openings in the inner and outer casings are brought into registration. This is preferably accomplished by moving the inner casing lon- 125 gitudinally to the outer casing. In the present instance this is accomplished by means of a spring 42 bearing against the end of the inner casin 37 and tending to move the inner casing toward the opposite end of the outer casing. This movement is limited by a thrust pin 43 mounted in that end of the outer casing toward which the in wardly on the plunger the inner casing may be moved against the tension of the spring 42 and the corresponding openings in the two casings brought into full alinement or complete registration. In this manner an increased amount of oil may be fed to the engine when operating under a temporarily heavy load and it is not desirable to alter the adjustment of the lubricating device. This construction also permits of the flooding of the device to clear the openings of any obstructions which may have gathered therein. The opening in the end of the outer casing through which the stem 43 passes has a bevel seat to receive a bevel collar 47 which is secured to the plunger 45 and engages the seat when the parts are in their normal positions, thus formin an effectual seal to prevent the escape 0 oil. The inner casing is preferably rotated from the gear 48 mounted on the shaft 24 and meshing with a corresponding gear 49 journaled on the end member of the frame and having a hollow stud 50 extending through the end of the outer casing 34. Preferably movement is transmitted from the stud 50 to the inner casing by means of the spring 42, this spring being secured at its opposite ends to the casing and to the stud. A stem 51 secured to the end of the inner casing and extending through the hollow stud serves to retain the parts in proper alinement.

The operation of the mechanism will be readily understood from the foregoing description and it will further be understood that the supplemental cylinder with the devices for controlling the admission of the explosive mixture to the engine cylinder or for controlling both the admission and the exhaust to and from the cylinder may be applied to the cylinder of an explosive engine in any suitable manner and in any suitable position; and that in a modified form it can be readily adapted to a two cycle engine as well as a four cycle engine. I, therefore, wish it to be understood that I do not desire to be limited to the details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder arranged in alinement with said main cylinder and communicating with a source of fluid supply and with said main cylinder, 1 a hollow supplemental piston within said supplemental cylinder and out of engagement with said main piston, said hollow piston having that end adjacent to said main cylinder open and having a port in its circumferential wall, and a device within said supplemental cylinder having a port and cooperating with said supplemental piston to control the communication between said supplemental cylinder and said source of supply.

2. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder arranged in axial alinement' with said main cylinder, communicating therewith and having inlet and exhaust ports arranged one above the other, cooperating members mounted within said supplemental cylinder and each having a single port, and means to cause the ports of both members to register simultaneously with said inlet port or with said exhaust port.

3. In an engine, a main cylinder, a main piston working in said main cylinder, :1 supplemental cylinder communicating with said main cylinder and having both an inlet port and an exhaust port, a hollow supplemental piston within said supplemental cylinder, out of engagement with said main piston, in open communication with said main cylinder and having a port, and a member mounted for movement relatively to said supplemental piston and having a port cooperating with the port of said supplemental piston to open and close both the inlet port and the exhaust port of said supplemental cylinder.

4. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having both an inlet port and an exhaust port, a hollow supplemental piston within said supplemental cylinder, out of engagement with said main piston, in open communication with said main cylinder and having a port, and a member movably mounted in said supplemental cylinder and having a port cooperatwith the port of said supplemental piston to open and close both the inlet port and the exhaust port of said supplemental cylinder.

5. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having both an inlet port and an exhaust port, a hollow supplemental piston within said supplemental cylinder, out of engagement with said main piston, in open communication with said main cylinder and Ill til

intense having a port cooperating with the port of said supplemental piston to open and "close looth the inlet port and the exhaust port of said supplemental cylinder. 7

6. In a four cycle combustion engine, a main cylinder, a main piston Working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port, a hollow supplemental piston mounted in said supplemental cylinder, in open communication with said main cylinder and having a port, a sleeve mounted in said supplemental cylinder and having a port cooperating with said supplemental piston'to control said inlet port, and means to cause said supplemental piston and said sleeve to make one complete reciprocation for every two complete reciprocations of said main piston.

7. In an engine, a main cylinder, and a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an in-- let port, a supplemental piston mounted within said supplemental cylinder, out of engagement with said main piston and having a port arranged to be moved into and out of alinement with said inlet port, and means cooperating with said supplemental piston to control said inlet port.

8. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port, a supplemental piston mounted within said supplemental cylinder, out of engagement with said main iston and having a port, a sleeve also having a port, and means to actuate said supplemental piston and said sleeve to cause their ports to register simultaneously with said inlet port.

9. In an engine, a main cylinder, a main piston, a supplemental cylinder communicating with said main cylinder and having an inlet port, a supplemental piston mounted within said supplemental cylinder, a sleeve between said supplemental piston and said supplemental cylinder, said supplemental cylinder and said sleeve having coiiperating ports, and means for actuating said sleeve and said supplemental piston to control said inlet port.

10. In an engine, a main cylinder, a man: piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port a supplemental piston mounted within sai supplemental cylinder out of engagement with said main piston and having a port, a sleeve mounted between said supplemental piston and said cylinder and also havlng a port, and means to actuate sa1d supplemental piston and said sleeve to cause their respective ports tobe simultaneously in register with said'inlet port.

v 11'. In an engine, a main cylinder, a main piston, an engine shaft connected with said main piston, a supplemental cylinder communicating with said main cylinder and having an inlet port, a hollow supplemental piston within said supplemental cylinder and in open communication with said-main cylinder, a sleeve coiiperating with said supplemental piston to control said inlet port, said supplemental cylinder and said sleeve having cooperating ports, and means for operatively connecting said supplemental piston and said sleeve with said engine shaft.

12. In-an engine, a main cylinder, a main piston working in said main cylinder, a

supplemental cylinder communicating with said main cylinder and having an inlet port, a supplemental piston within said supplemental cylinder and out of, engagement with said main piston, and a member mounted in said supplemental cylinder and having movement relatively to said supplemental piston and said supplemental cylinder and said supplemental piston and said member having ports cooperating to control said inlet port.

13. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port, a supplemental piston within said supplemental cylinder and out of engagement with said main piston, and havinga port, a member mounted between said supplemental piston and said supplemental cylinder, having movement relatively to both of said ports and provided with a port, and means to cause the port of said supplemental piston and the port in said member to simultaneously register with said inlet port.

14. In an engine, a main cylinder, a main piston Working in said main cylinder, a supplemental cylinder communicating with saidmain cylinder and having an inlet port and an exhaust port, movable members supported adjacent to said supplemental cylinder and each having a single port, said ports cotiperating to open and close said inlet port and to open and close said exhaust port, and means for actuating said members.

15. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, cooperating members mounted within said supplemental cylinder and out of engagement with said main piston, having movement relatively one to the other and to said cylindemand each provided with a port, and means to actuate said cooperating members to cause their ports to register simultaneously with either said inlet portor said exhaust supplemental cylinder.

16. In anengine, a main cylinder, a main port of said .piston working in said main cylinder, a supplemental cylinder communicating with said supplemental piston and said sleeve to control said inlet port and said exhaust port. 17. In an engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, a supplemental piston supported out of engagement with said main piston having a port, a sleeve interposed between said supplemental piston and said supplemental cylinder and also having a port, and means for actuating said supple-4 mental piston and said sleeve to cause their ports to register simultaneously with either said inlet port or said exhaust port- .18. In a four cycle internal combustion engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, a supplemental piston within said cylinder and out of engagement with said main piston, and having a port, and means for moving said supplemental piston downward and connecting the same with said exhaust port-on the exhaust stroke of said main piston.

19. In a four cycle internal combustion engine, a main cylinder, a main piston working in said main cylinder, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, a supplemental piston within said cylinder and out of engagement with said main piston and having a' port, and means to move said supplemental piston upward and to close both of said ports in said supplemental cylinder on the compression stroke of said main piston, thereby causing a portion of the explosive mixture to be compressed in sald supplemental cylinder.

20. In a four cycle internal combustion engine, a main cylinder, a mainpiston, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, a supplemental piston mounted in said cylinder, means for causing said supplemental piston to make one complete reciprocation for every two complete reciprocations of said main'piston and to so time the movement of said supplemental piston that it will be near its lowermost position at the end of the exhaust stroke of the main piston and near its uppermost position at the end of the compression stroke of the main piston, and a spark plug carried by said supplemental piston.

21. In a four cycle internal combustion engine, a main cylinder, a main piston, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, a supplemental piston mounted in said cylinder, means for causing said supplemental piston to make one complete reciprocation for every two complete reciprocations of said main piston and to so time the movement of said supplemental piston that it will be near its lowermost position at the end of the exhaust stroke of the main piston and near its uppermost position at the end of the compression stroke of the main piston, a spark plug carried by said supplemental piston, and means for closing the circuit through said plug as said supplemental piston nears its uppermost position.

22. In a four cycle internal combustion engine, a main cylinder, a main piston, a supplemental cylinder communicating with said main cylinder and having an inlet port and an exhaust port, a supplemental piston mounted in said cylinder, means for causing said supplemental piston to make one complete reciprocation for every two complete reciprocations of said main piston and to so time the movement of said supplemental piston that it will be in its lowermost position at the end of the exhaust stroke of the main piston'and near its uppermost position at the end of the compression stroke of the main piston, a spark plug carried by said supplemental piston, a contact finger supported above said supplemental cylinder and arranged to be engaged by said spark plug to close the circuit through the same when said supplemental piston approaches its uppermost position.

23. Inan engine, a main cylinder, amain piston, a supplemental cylinder communicating with said main cylinder and with the source of fluid supply, a supplemental piston mounted in said supplemental cylinder, a spark plug carried by said supplemental piston, and means to close the circuit through said spark plug as said main piston approaches the end of its compression stroke.

24. In an engine, a main cylinder, a main piston, a supplemental cylinder communicating with said main cylinder and with the source of fluid supply, a supplemental piston mounted in said supplemental cylinder, a spark plug carried by said supplemental piston, and a contact member arranged to be engaged by said spark plug to close the circuitthrough the same as said main piston approaches the end of its compression stroke.

- incense 25. An engine comprising a plurality of cylinders, each comprising a main cylinder, a main piston, a supplemental cylinder communicating with the main cylinder and with a source of fluid supply, a supplemental piston mounted in said supplemental cylinder, and a spark plug mounted in said supplemental piston, a contract member supported adjacent to the supplemental cylinder of each of said main cylinders and arranged to be engaged by said spark plug to close the circuit therethrough, a source of electrical current, and a single circuit extending from said source of current and connected with each of said contact members.

26. In an engine, a main cylinder, a main piston, an engine shaft connected with said main piston, a supplemental cylinder communicating with said main cylinder and with a source of fluid supply, a supplemental piston mounted in said supplemental cylinder, a part cooperating with said supplemental piston to control the communication between said supplemental cylinder and the source of supply,-a shaft supported adjacent to said supplemental cylinder and operatively connected with said engine shaft, eccentrics mounted on said shaft, and eccentric straps connecting said eccentrlcs,

respectively, with said supplemental piston and its cooperating part, and a lubricating device supported above said shaft and arranged to discharge a lubricant upon said eccentrics.

27. In an engine, a main cylinder, a main piston, an engine shaft connected with said main piston, a supplemental cylinder communicating with said main cylinder and with a source of fluid supply, a supplemental piston mounted in said supplemental cylinder, a part cooperating with said supplemental piston to control the communication between said supplemental cylinder and the source of supply, a shaft mounted above said supplemental cylinder and connected with said engine shaft, connections between said shaft and said supplemental piston and its cooperating part, respectively, and a lubricating device arranged above said shaft and adapted to discharge a lubricant upon each of said connections.

28. In an engine, a main cylinder, a main piston, an engine shaft'connected with said main piston, a supplemental cylinder communicating with said main cylinder and with the source of fluid supply, a supplemental piston, and a part cooperating therewith to control the communication between said supplemental cylinder and said source of fluid supply, a shaft arranged adjacent to said supplemental cylinder and operatively connected with said engine shaft, connections between said shaft and said supplemental piston and its cooperating part, respectively a housing inclosing said shaft and said connection, and a lubricating device mounted within said housing and arranged to discharge a lubricant onto said connections.

29. In an engine, a main cylinder, a main piston, a carbureter, a supplemental cylinder communicating with said main cylinder and connected with said carbureter, a supplemental' piston mounted in said supplemental cylinder, a part cooperating with said supplemental piston to control the connection between said supplemental cylinder and said carbureter, a housing extending upwardly from said supplemental cylinder, and a conduit leading from said housing to said carbureter.

In testimony whereof, I affixmy signature in presence of two witnesses.

CHAS. A. SAWTELLE.

Witnesses:

BARRY S. MURPHY, F. W. SCI-IAEFER. 

